Pressing Ctrl+D when the terminal is in raw mode

Question

When the terminal is not in raw mode, if I write some text, this text will be placed in a buffer (I think it's called the line buffer), after that if I press Ctrl+D, the content of this buffer will be sent to my application.

But what happens when I press Ctrl+D and the terminal is in raw mode (i.e. what I write in the terminal is not buffered but rather it's sent directly to my application), will some ASCII code (probably 0x04) be sent to my application?

Answer 1

You can check that with strace

In shell 1:

$ echo $$
1234

In shell 2:

strace -p 1234 -f

In shell 1:

$ stty raw
$ cat
[type something including ^D]

In Shell 2 you can see:

[pid 12345] read(0, "\4", 131072)       = 1